蒲城县电厂灰土挤密桩复合地基试验成果——消除深层黄土湿陷性方法的探讨

本文介绍了灰土挤密桩复合地基的试验结果。结果表明,灰土挤密桩可消除深层黄土地基的湿陷性。挤密后复合地基的承载力可达250kPa以上。     

灰土挤密桩在电厂冷却塔地基中的应用

介绍灰土挤密桩在水工构筑物地基处理中的应用,通过对高湿陷、大厚度自重湿陷性黄土地基加固处理的工程实践,探讨灰土挤密桩在加固湿陷性地基方面的加固效果.     

湿陷性黄土地区煤仓地基的灰土挤密桩法处理

灰土挤密桩法是湿陷性黄土地区小直径筒仓施工常用的地基处理方法。该方法施工工艺简单,不需要复杂的设备;施工速度快,且桩身材料造价低,经济合理。分析了灰土挤密桩地基处理方法的优缺点及适用性,结合工程实例,介绍了湿陷性黄土地区灰土挤密桩法的设计和施工要点。     

灰土挤密桩在处理湿陷性黄土地基中的应用

通过理论诠释了灰土挤密桩加固地基的原理,通过实践及实测数据证实了加固地基的效果。分析了推广灰土挤密桩对处理湿陷性黄土地基的经济性和适用性。     

在坚硬湿陷性黄土中灰土挤密桩的应用

本文针对在晋中地区坚硬湿陷性黄土中不能采用灰土挤密桩的现状，通过工程实践和对施工机具改进，施工获得成功，综合效率约提高３倍，改变了晋中地区在湿陷性黄土中不能采用灰土挤密桩的观点，为本地区在此类型土中，采用灰土挤密桩处理地基积累了经验     

灰土夯扩挤密桩在小高层地基处理中的应用

 灰土夯扩挤密桩处理湿陷性黄土地基,能有效的消除湿陷性,提高天然地基的承载力,减少地基的沉降量,而且施工速度快,经济效益明显。本文着重介绍了灰土夯扩挤密桩在小高层湿陷性黄土地基中的应用并对质量检测结果进行分析,从而体现它的经济合理,安全适用性。     

采用二灰土挤密桩改善湿陷性黄土性能试验与施工

某高速公路一通道涵的湿陷性黄土地基，其承载力低、湿陷性沉降大，为此采用生石灰、粉煤灰二灰土挤密桩加固，改善其性能。加固的主要机理为生石灰遇水膨胀，挤密桩间土；石灰、粉煤灰与土反应形成多种不易溶于水的矿物，从而提高复合地基承载力和减少沉降量。主要介绍二灰土挤密桩的试验与施工。     

灰土挤密桩法在湿陷性黄土地基处理中的应用

通过介绍湿陷性黄土的工程特性、灰土挤密桩的工作原理,结合几个成功的工程实例,介绍了灰土挤密桩法在处理湿陷性黄土地基中的应用,并对其地层适用条件和施工中容易出现的问题提出了一些看法,为以后湿陷性黄土地基处理提供一些借鉴和启示.     

灰土挤密桩处理湿陷性黄土地基的施工与检测

结合工程实例，介绍灰土挤密桩处理湿陷性黄土地基的施工与检测方法。     

挤密浸水转移法及在工程应用中应注意的若干问题

挤密浸水转移法及在工程应用中应注意的若干问题余雄飞，汤高举（新疆工学院建工系）１引言目前，黄土地基处理常用方法有人工垫层地基（灰土或碎石垫层）、强夯、振冲碎石桩、灰土挤密桩、灌注桩、大直径扩底墩及预浸水法和化学加固法等。事实上，湿陷性黄土的地基处理方...     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。